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Investment Securities - Additional Information (Detail) | Mar. 31, 2014 Security | Dec. 31, 2013 Security
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Investments Debt And Equity Securities [Abstract] |  |
Number of securities having unrealized holding losses with aggregate depreciation | 11 | 11
Unrealized holding losses depreciation | 2.10% | 3.20%

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- Definition Unrealized holding losses depreciation percentage from amortized cost. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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